Question

在下面的$aggregate查询中，想要添加一个$gt和$lt

的过滤器

mongo doc：

{
    "_id" : ObjectId("599eb4fae0f86361c36b1c91"),
    "device_id" : ObjectId("5993df1b9a5fea3183064e49"),
    "updatedAt" : ISODate("2017-08-24T11:38:12.135Z"),
    "power_data" : [ 
        {
            "timestamp" : ISODate("2017-08-24T11:14:04.256Z"),
            "_id" : ObjectId("599eb4fdeea8c69622751de3"),
            "pfactor" : 1,
            "rpower" : 0,
            "voltage" : 0,
            "current" : 0,
            "energy" : 0,
            "power" : 0
        }, 
        {
            "timestamp" : ISODate("2017-08-24T11:14:04.256Z"),
            "_id" : ObjectId("599eb507eea8c69622751de4"),
            "pfactor" : 1,
            "rpower" : 0,
            "voltage" : 0,
            "current" : 0,
            "energy" : 0,
            "power" : 0
        }, 
        {
            "timestamp" : ISODate("2017-08-24T11:14:04.256Z"),
            "_id" : ObjectId("599eb511eea8c69622751de5"),
            "pfactor" : 1,
            "rpower" : 0,
            "voltage" : 0,
            "current" : 0,
            "energy" : 0,
            "power" : 0
        }, 
 ],
    "__v" : 0,
    "createdAt" : ISODate("2017-08-24T11:14:05.946Z")
}

这是查询：

aggregate([{
        $match: { "device_id": { $in: [ObjectId("5993df1b9a5fea3183064e49")] } }
    }, {
        $project: {
            "power_data": 1
        }
    }, {
        $unwind: "$power_data"
    }, 
     {     
        $project: {
           "power": "$power_data.power", "hours": { $dayOfMonth: "$power_data.timestamp" }
        }
    }, {
        $group: {
            "_id": "$hours", "avg_power": { $avg: "$power" }
        }
    }]

所有我想要的是，通过传递一些日期时间戳范围，我将只得到这个时间间隔的数据，目前它的整体计算。

谢谢您宝贵的时间！

Answer 1

我认为您只需在$match之后添加额外的$unwind阶段。

这是完整的管道：

{
    $match: { "device_id": { $in: [ObjectId("5993df1b9a5fea3183064e49")] } }
}, 
{
    $project: { "power_data": 1 }
},
{
    $unwind: "$power_data"
}, 
{
    $match: {
        "power_data.timestamp" : { $gt : ISODate("2017-08-23T12:00:00.000Z"), $lt: ISODate("2017-08-25T12:00:00.000Z")}
    }
},
{     
    $project: { "power": "$power_data.power", "hours": { $dayOfMonth: "$power_data.timestamp" }
}
},
{
    $group: { "_id": "$hours", "avg_power": { $avg: "$power" } }
}

过滤聚合和groupby以从给定的时间间隔获取值

1 个答案: